
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:25 AM
micromass

1 
30,689 
The opposite of a great truth is also a great truth  T. Mann
For example, the opposite of empty set {} is a...

Jul1711 01:23 AM
chiro

2 
1,904 
Hey,
I am trying to find the probability that exactly two people out of m have the same birthday. I know that the...

Jul1511 02:12 AM
ndrue

15 
15,237 
I was wondering if anyone could help me with this, I've been trying to curve fit Young's formula for double slit...

Jul2611 04:41 PM
pmsrw3

5 
2,831 
I'm wondering how conditional probability relates to concepts of sample space, observation space, random variable,...

Jul1511 08:18 AM
Rasalhague

6 
1,655 
Hey all.
I have some data, approximately 6 months worth. It is values that do not depend on time but are...

Jul1811 10:48 AM
kdbnlin78

13 
1,935 
What is the function that I get when I take a large sample from an exponential distribution (many values from the same...

Jul1511 08:22 AM
pmsrw3

7 
1,205 
A random variable is defined as a function from one set, called a sample space, to another, called an observation...

Jul1511 06:19 PM
micromass

9 
1,105 
Here, to further test my understanding, is an attempt to apply the measury theory definitions of a probability space...

Jul1511 07:02 PM
micromass

5 
2,600 
Given 4 axioms in real Nos:
1) 1x = x ,for all x
2) x+0 = x ,for all x
3) (x+y)z = xz+yz ,for all x,y,z
4)...

Jul1611 08:04 PM
evagelos

2 
882 
I am dealing with the following interesting combinatorics problem, several reformulations of which haven't help me...

Jul2511 03:57 AM
madison54

5 
1,597 
Hello,
I am teaching myself Set Theory, and in doing some exercises I came across the problem:
Given sets A and...

Jul2611 12:00 AM
praeclarum

8 
2,110 
Does every infinite set contain an infinite, countable subset?
If so, why? (I'm assuming this depends on the Axiom...

Jul2211 03:27 PM
mathman

25 
5,392 
Hello all,
I'm currently working on a problem in which I'm attempting to characterize a centered Gaussian random...

Jul1711 08:32 AM
Aimless

1 
1,823 
These three quotes talk about the use of the Poisson and normal distributions as approximations for the binomial when...

Jul1711 11:01 AM
Rasalhague

3 
2,262 
prove the following equivalences:
1)\neg\forall x\neg Fx\Longleftrightarrow\exists xFx
2)\neg\forall x...

Jul1711 07:58 AM
evagelos

0 
834 
In an ANOVA experiment, you have,
group mean \overline{y}.
overall mean \overline{y}..
Are they independent? ...

Jul1811 04:23 PM
colstat

20 
2,163 
Hello,
Let X be a set of N lognormal prices (in dollars), meaning
\log(X) = Y \sim MN(\mu_Y , \Sigma_Y) ,
i.e....

Jul2011 11:31 AM
mtal

6 
1,484 
Hi,
could someone possible make something clear for me  I have come across this notation for a binomial PMF formed...

Jul2011 07:56 AM
EmmaSaunders1

9 
1,882 
If the set of real numbers is considered as a sample space with the Borel sigma algebra for its events, and also as an...

Jul1911 01:51 PM
disregardthat

7 
1,632 
Here's the issue. I have two curves that are dependent on each other (part of a bigger solution set). The logic of...

Jul1911 05:14 PM
tangodirt

0 
670 
Hi all,
I'm new to the forum, this is my problem:
given a positive integer n, i want to find how many combinations...

Jul2411 05:30 PM
mapkan

2 
2,300 
I've just read a paper that references the use of studentt orthogonal polynomials. I understand how the GaussHermite...

Jul2411 06:29 PM
64jnk

2 
1,051 
What book or course would you recomend to a beginner in Probability and Statistics?
That is my question. However I...

Jul2111 08:50 PM
chiro

5 
2,003 
Hello,
I am trying to figure out what test to use in order to solve a fairly basic concept. I am not sure if this is...

Jul2111 10:23 AM
Stephen Tashi

5 
1,003 
My course notes and textbook express this differently:
To construct the confidence interval for diff. between...

Jul2211 11:02 AM
pmsrw3

1 
1,291 
Goal
The goal is to create a weighted average of global rankings. Does not have to be perfectly accurate (if that was...

Jul2411 08:26 AM
pmsrw3

4 
2,040 
I'm reading a stat textbook and it says the following:
Let a discretetime random walk be defined by Xt = Xt1 +...

Jul2111 08:52 PM
chiro

11 
4,907 
Hi, All:
The standard way of approaching the birthday problem, i.e., the problem of
determining the...

Jul2211 07:49 AM
Bacle

2 
1,319 
I have read that the statistic computed for the unpaired two sample ttest is:
t = \frac{\bar{x} ...

Jul2211 02:05 AM
chever

2 
1,753 
I am intrigued by the idea of changing/dynamic transition probability matrix instead of the assumption of constant...

Jul2211 02:18 PM
Stephen Tashi

1 
1,993 
Hi all,
I am trying to devise a mathematical model for my project I am working at. Description is as follows:
we...

Jul2611 12:47 PM
pmsrw3

19 
2,769 
Theorem:
A stationary AR(1) model can be expressed in terms of MA(infinity).
Proof:...

Jul2311 07:15 AM
pmsrw3

3 
5,203 
a vase contains one red ball two white balls and three black balls. n balls are take out of the vase and (each ball...

Jul2411 03:59 AM
ENgez

6 
1,183 
Suppose the random variables Xi's are independent,
then is it always true that Var(X_1 + X_2 + X_3 +...) = Var(X_1) +...

Jul2311 07:54 AM
pmsrw3

1 
1,343 
Hello.
As I understand, in the classical logic it's impossible to "take", for example, the set of all sets.
I...

Jul2611 12:09 AM
Hurkyl

8 
1,873 
Ok someone tell me the official explanation of why alpha cannot be zero in hypothesis testing.

Jul2411 07:46 AM
pmsrw3

1 
1,187 
Hello. Say that I want to express a set consisting of the values of a continuous function, G(x), over a range of...

Jul2611 12:01 PM
praeclarum

9 
2,616 
I will try to be brief, so please bear with me!
I have a Matlab program which simulates a particle's movement over...

Jul2511 04:19 PM
skyflashings

2 
1,280 
Suppose I have 2 sets of data: day1 and day2. I want to fit a model to both data sets and then compare them to each...

Jul2711 11:15 AM
Stephen Tashi

1 
1,616 
Hi all,
I am having trouble with the concept of joint pdf's. For example  a set Z1,Z2,...ZN are each gaussian rv....

Jul2711 10:58 AM
bpet

7 
1,890 